Engine suspension means



July 26, 1949. J. M. TYLER EI'AL ENGINE SUSPENSION BEANS Filed Feb; 24, 1945 2 Sheets-Sheet 1 INVENTOR 4 John M.T leg 0 Andrew aim/1 00., Yfl v g 5 AGENT.

July 26,1949. J. MQTYLERETAL 2,477,501

ENGINE SUSPENSION MEANS l I I r INVENTOR John M filler 1 /Mdrew M Nil/gods AGENT.

ment of the pad relative to the core.

' also extend fore and aft in a plane normal to the attaching shoe 33 secured to the engine crank-j case 3| by cap screws 32. The two points of attachment ofv thebracket to the engine are su h that the longitudinal, or major, axis of the bracket is'so inclined with respect to the axis of rotation.

of the engine that the axes of the several brackets intersect at a common point on the engine axis. The pivotal connection of the strut 29 to the shoe 30 is provided by a bolt 33 whichextends through a pair of upstanding spaced ears 34 on the shoe and through the end of 'st'rut29. Loading faces 36 and 38 are provided on the shoe 30 for .cooperation with faces 31 and 39.;of the crankcase 3|. Faces 36 and 38 are formed in parallel planes normal to the engine axis and normal to the faces 26. Close tolerances are maintained between the faces 38, 38 and 31, 39, respectively, so that there will be no fore and aft movement of the shoe with respect to the crankcase as the foreand aft loads vary, and consequently the cap screws 32 will not be placed in shear.

The flexible core housing 20 formsa generally cup-shaped-chamber having its open mouth adjacent the ring and in which the flexible pedestal of the mount unit is received in substantially axial alignment with the housing.

The ring I6 is provided at each engine mount unit location with a stud receiving sleeve '40 which extends through the cross-section of the ring and is permanently welded thereto, this sleeve being axially aligned with'the strut 2 9 and housing 20 of the bracket in position to receive a pedestal stud 42. Stud 42 has a head 44 provided with a non-circular turning recess 45 and a flange 46 overlying the outer end'of the sleeve 40 and terminates in an inner end 41 which is screwthreaded into an axial passage 48 in a mushroom-' shaped core 50 of the resilient pedestal element, suitable enlargements being provided on the head and on the shank of the stud to center the stud in the eleeve 40. I

The-abutting ends of the core53 and the sleeve 40 are provided with interlocking means for preventing rotation of'the core during turning of the stud 42. Herein this interlocking means comprises a diametrical slot 5| in the end of the core and corresponding tongues 5|a on the end of the sleeve 40. i It will be noted that the slot 5| lies in a plane at right angles to the axis of pivot 33 so that the bracket can swing free from the sleeve 40 about pivot ,33 when stud 42 has been removed fromcore 50.

Core so, which 45 located within the chamber of the housing 23,'has the usual generally fiat,

circular rubber pads 52 and 54 bonded to opposite sides of thehead 55 thereof which are provided with parallel metal inserts for increasing their stiffness in compression in a usual manner.

Pad 52 has an outer metal plate 52a bonded thereto which is received in a recess in the bottom of the chamber for positioning the pad against lateral displacement therein. Pad 54, which is bonded to the other side of the head 55, is provided with an annular passage 56 therein through which the axial stem 58. of the core passes with suflicient clearance to permit move- As shown in Fig. 4, the passage 56, in the no-torque position of the parts, is somewhatueccentrically loup cated relative to the stem 53 in the line of th periphery of the ring to allow for the torqu wind-up of the enginein the direction of th arrow in Fig. 4; in the usual manner.

Pad 54 has a. metal plate 60, bonded to its cute face which is received in a recess in a cover plat 62 screw-threaded into the mouth of the housim 20, suitable spanner engaging notches 34 bein: provided for rotating the cover to provide initia compression of the pads as desired. The cove 62 also has an enlarged passage 33 in the vicinit: of stem 58 for permitting the cover to move lat erally relative to the stem as torsional loads an applied to the housing 23 from the blower casin attachment. a

-, It will be noted (Fig. 4) that the portion 53a 0: stem 58 which extends through the cover'aperture 65 is elliptical in cross-section, and that th( major axis of the elliptical portion is locatec radially of the mount ring so that only a, smali movement is permitted between the stem and thi wall of cover passage '63 under radial forces whereas a greater movement is permitted under torsional forces. I

Improved frictional damping means are associated with each bracket, acting in parallel with the shear action of the resilient pads 52 and 54, for damping movements of the engine. This means. comprises a plate member 53 having friction materialiilon opposite faces thereof in position to engage both the outer surface of the cover '62 and a plate 10 located alongside the friction, material remote from the cover. A spring 12, herein shown as a Belleville Spring stressed into a flattened condition, constantly urges the parts into frictional engagement and is held in place in the housing by a locking ring 14. The plate 68 which carries the friction material is piloted on an elongated, reduced stem portion 15 of stem 58 and is free to move axially therealong as axial loads are imposed on the pads.

It will be noted that as a result of having the pedestal stud 42 inserted through the mount ring and in the longitudinal axis of the bracket, all major loads are applied to the mount ring through the centerline of the mount ring crosssection so that no torsional load is applied to the ring about its cross-sectional periphery.

4s a result of the above described construction it is made possible to ,support an engine from a single mount ring by izwo attachments along the rotational axis of the engine, one to the blower casing and the other to the crankcase at a point straight line so as to eliminate all bending moments, and due to the holes or slots in bosses 24 through which cap screws 23extend (see Fig. 5), these loads are not transmitted to the blower casing ;22 and it is not necessary to maintain close tolerances between either land 36 or 33 and the holes in the blower casing which receive the cap screws 23. It will be evident that radial forces are transmitted directly from pads 25 on the blower case to bosses 24 on the housing 23, while torsional forces are transmitted from fore and aft faces 2'! on these pads to corresponding faces 26 on lugs 28 of th housing 23.

. It will also be evident that with the damper spring 12 supported on the housing '23 so that i the brackets;

this spring is fixed relative to the housing ad with the friction material alidable relative to th pedestal:@stemiportionkllz there iwill nof'vn j j tion inw the spring pressurerapplied to the damp-j ins .:meansgunder;tension ompressio jmThezconstructionebov "described gl m 11 em v l of :1 a: defectivep-zenginel mount uni r mwthe installation,withoutirem mw ne IQmmthe qairplane iv pivot bolt n removing-the 'cap screws 23 whic' ta h the housing: to the:r.-;blower casing,an ilna removingrtheiwbracket ifromithe engine by moving ,capg' screws itl lrrwhich -perni pletehremoval ofi thedefective engine mo x shown and 11583011581! H he? e i a m the scopetot the invention 0,1,, following claims.

ntin brackets for connecting thei ehgine"to said' support, each hea sa d br se ,ie lud astaw ede i hating its longitudinal axis disposedxsfitqankanglelifi to the axis of rotation i th engine,,a,pedestal *n'g "fing having its center substantially coincident with the axis of rotation of the 40 housi said axis of rotation and intersecting the latter at a point forward of said ring and intersecting 'I'he shoe an canwbetthemdetached ii comprising an enth stains-ea having a rigid connectlon t rt, a's

In an engine mount having ng flexibly connected by resilient material for relative axial and lateral movements, a pair of frictionally engaged members carried respectively by said core and said housing for relative lateral movement therewith, and means includsaid ring at spaced points about; th periphery ing a spring carried by said housing for mainthereof, each of said brackets comprising a stem pivotally connected to the engine at one end for transmittingv loads along the longitudinal axis of the bracket and having an enlargement atits estal having a head receivable in said housing, a stud extended therefrom and carried by said ring, and resilient pads interposed between confronting faces of said housing and head, and a rigid taining saidmembers in substantially constant frictional engagement with a force which'is substantially unafiected by relative movements of said core and housing.

= ther nd constituting a housing, a flexibl pad- 8. A pedestal type bracket for connecting an engine to an engine support including a flexible pedestal housing carried by the engine and having its longitudinal axis inclined with respect to the axis of rotation of the engine, said housing connection between saidhousing and engine 10- having a fixed connection with said engine adcated between said pivotal connection and ring for transmitting radial and torsional loads from said engin to said housing.

3. A bracket for securing an engine to an enjacent said support and a pivotal connection with said engine at a point more remote from said support, a flexible core receivable in said housing including a core head having surfaces transverse gine support comprising, a pedestal housing hav- 5 to the axis of said bracket and having resilient inga fixed support on the engine, a rigid stem on said housing having its longitudinal axis disposed at an angle to the axis of rotation of the engine and having a pivotal connection at its free end with the engine, a pedestal core in said housing, resilient pads interposed between confronting surfaces on said housing and core, and a stud carried by the engine support aligned with said stem and having a threaded connection with said core.

4. A bracket for connecting an engine to an engine support comprising, a pedestal housing having a rigid connection to the engine, a stem rigidly connected with said housing and having its free end pivtoally connected to the engine, said housing and stem having a common longitupads interposed between said surfaces and confronting surfaces of said housing, said support having a' bracket attaching stud extended through a portion thereof in the axis of said bracket and screw-threaded into said core, and

, cooperating interlocking means on said support and means carried by each of said brackets forma core and a in; two mutually perpendicular surfaces ,cooperating with two mutually perpendicular surfaces formed on said blower case for respectively transmittin'g radial and torsional loads between said engine and said brackets, and means forming a port, each of said brackets having a fixed con nection to said engine blower case including confronting faces on said blower case and bracket for transmitting torsional and rad a1 forces from the engine to said brackets and a having a connection to said engine crankcase including confronting faces on said crankcase andbracket disposed normal to said axis of rotation for transmitting fore and aft loads from the engine crankcase to said brackets.

- 11. Flexible engine mount comprising, an. en gine carried member, a support, carried member, one of said members including a housing and the other a pedestal having a head portion disposed in said housing and a stem extending through an aperture in a wall of said housing and having an elliptical cross-sectional portion in the vicinity of said aperture, resilient pads disposed between confronting faces on said head and housing, said elliptical stem portion being smaller than said aperture and cooperating with the walls of the latter to limit the relative movement between said members, the major axis of said ellipse being in a direction of radial forcesexerted by the engine for permitting greater movement of the engine under torsional forces than radial forces.

12. In a mounting system for a radial aircraft engine having a plurality of easing sections, a mount ring, a plurality of mounting brackets connected with, said mount ring, each of said mounting brackets including a mushroom-shaped core member attached to said ring and bellshaped housing member having an elongated strut member extendin' said strut members and one tions for transmitting fore and aft loads between said engine and said brackets, and a connection between each of said housing members and -,an-

other of said casing sections for transmitting torsional loads between said engine and said brackets.

1 JOHN MORELAND TYLER.

7 ANDREW V. D. .WILLGOOS.

REEERENCES CITED rhe following references are oi record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,175,999 Taylor ..a c... Oct. 10, 1939 2,241,139 Julien at al. May 6, 1941 2,241,408 Lord May 13, 1941 2,317,501 Tyler Apr. 27, 1943 2,377,492 Gorton June 5, 1945 2,411,562 Thompson Nov. 26, 1946 g therefrom, said core andhousing members. being connected by interposed resilient material, a connection between each of of said casing sec- 

